/Engine/Source/Runtime/GeometryCore/Public/Spatial/SparseDynamicPointOctree3.h
Find nearest ray-hit point with Points in tree
PointID of hit Point, or -1 on miss
int32 FindNearestHitPoint ( const FRay3d & Ray, [TFunctionRef](API\Runtime\Core\GenericPlatform\TFunctionRef)< double(int, const FRay3d &)> HitPointDistFunc, double MaxDistance ) const